This is just an RFC to reduce some of the more obvious stack usage in pagereclaim. It's a bit rushed and I haven't tested this yet but am sendingit out as there may be others working on similar material and would ratheravoid overlap. I built on some of Kosaki Motohiro's work.

On X86 bit, stack usage figures (generated using a modified bloat-o-meterthat uses checkstack.pl as its input) change in the following ways afterthe series of patches.